Electric-arc lamp



(No Model.)

' J. A. MOSHER.

ELECTRIC ARC LAMP.

No. 579,161. Patented Mar.23,1897.

Starts ATENT rrrcn.

JOHN A. MOSHER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE ADAMS &

I/VESTLAKE COMPANY, OF ILLINOIS.

ELECTRiC=ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 579,161, dated March 23, 1897. Application filed October 22, 1896. Serial No. 609,756. (No model.)

To aZZ whom, it may concern.-

Be it known that I, JOHN A. MOSHER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do declare the following to be a full,c1ear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to inclosed arc-lam ps, its object being to provide means for mounting a small arc-inclosing envelop so that the carbons may both be recip-rocated by the regulating mechanism of the lamp. I The invention consists in the special construction of the frame of the lamp in combination with the arc-inclosing envelop and its appurtenances.

In the accompanying drawings, Figure 1 is a side elevation of the lamp, some portions being broken away for the purpose of revealing the internal construction. Fig. 2 is a plan section on the line 2 2 of Fig. 1. Fig. 3 is a central vertical section of the sleeve adapted to the upper aperture of the envelop and to receive the upper carbon; and Fig. 4 is an elevation, partly broken away, of the sleeve adapted to the lower aperture of the envelop. The frame of the lamp consists of the two parallel posts A A, pendent from a plate B, upon which the regulating mechanism is mounted; a cap B for covering the regulating mechanism and which is attached to the plate B by means of the vertical posts I) l); the cross-bars a a, in vertical alinement and connecting the two posts A A and adapted to retain the envelop Z in position; the parallel guide-rods O O, mounted between the posts A A and extending from the plate B to the cross-bar a, but insulated therefrom, and being adapted to guide the holder D of the upper carbon to, and parallel guide-rods o c, pendent from the cross-arm a and tied together at their lower ends by an apertured plate 0 being adapted to guide the holder 61 of the lower carbon y.

The carbon-holders D d are united by means of a chain or cable E and a connecting-rod the latter passing through the cross-arms a a and being guided thereby, the chain E being turned over a sheave F, mounted in floorhangers f, (only one of which is shown,) supported by the plate B, this sheave being pro. vided with ratchet-teeth upon its periphery.

The upper-carbon holder D is superior in weight to the lower holder (Z and the feed is by gravity, the descent of the uppencarbon holder causing the elevation of the lower one. The regulation of the lamp is accomplished by means of apawl G, cooperating with the ratchet-teeth of the sheave F and controlled by means of a roclclever H, which is actuated by a solenoid comprising the helix K and the core in, a retractile spring M, connecting one end of the lever to the plate B, acting in opposition to the solenoid. The helix K is in series with the are, being connected by means of the insulated wire R with one of the terminals (not shown) of the circuit and by means of the insulated wires 0' r with the holder D of the carbon on. One of the terminals of the circuit (shown at S) is electrically connected with the frame of the lamp, and through it with the carbon y, a wire 5 preferably leading from a fixed part of the lamp-frame, as one of the posts A, to the carbon-holder cl, so as to insure a perfect connection. I

Inasmuch as the regulating mechanism forms no part of the present invention. and may be of any desired form of construction, I have not deemed it necessary to show it in detail.

The envelop Z may be either transparent or translucent and may be of porcelain or glass, and if of the latter it may be ground or otherwise treated for the purpose of prevent ing direct radiation. This envelop has an upper and lower aperture, each surrounded by an axially'extendingflange or neck. The

lower neck rests within an annular flange of a sleeve Q, adapted to rest within an aperture in the cross-bar a, the upper neck being received within an annular flange o of a sleeve O, adapted to enter and slide within an aperture in the cross-arm a.

It is important that the sleeve 0, which is preferably of metal and which is necessarily in contact with the frame of the lamp, be insulated from the carbon w. This is accomplished by the use of a bushing P, secured Within the sleeve, preferably by screw-threading, and which is of non-conducting refractory material, such as lava. This bushing fits as closely to the carbon as is practical without causing friction, so that air is substantially excluded from admission to the envelop. The lower aperture of the envelop is similarly closed by the adaptation of the sleeve Q to the size of the lower carbon. The bushing may be applied to the sleeve Q or not, as may be desired.

In trimming the lamp the upper carbon is passed downwardly through the sleeve 0 and the lower carbon is passed upwardly through the aperture in the tie-plate 0 In lamps of this type the arc-inclosing envelop is apt to have a deposit formed upon its inner wall by reason of the combustion of the carbons, and hence it should be easily removable from the lamp for the purpose of cleaning. This is provided for in the construction shown by spacing the cross-arms a a a little farther apart than the length of the envelop Z, so that the sleeve 0 may be raised to free the upper end of the envelop.

While I have shown the arc-inclosing envelop as oblong and having its apertures each surrounded by an axially-projecting neck whereby it may be secured in position, it is obvious that it might be spherical and that the means for securing it in place in the frame may be varied.

It is important that the carbon pencils be free to reciprocate Within the apertures of the envelop, while so nearly closing them that the circulation of air will be prevented by the slight outward pressure developed by the combustion of the carbons.

I claim as my invention 1. In an electric-arc lamp the combination with a frame having a pair of side posts, of a pair of vertically-alined apertured cross-bars uniting the posts, a diaphanous arc-inclosing envelop seated upon the lower cross-bar and having a pair of carbon-receiving apertures upon its vertical axis and in alinement with the apertures of the cross-bars, and a sleeve adapted to slide within the aperture of the upper cross-bar and to engage and hold the envelop.

2. In an electric-arc lamp the combination with a frame havinga pair of side posts, of a pair of vertically-alined apertured cross-bars uniting the posts, a diaphanous arc-inclosing envelop seated upon the lower cross-bar and having a pair of carbon-receivin g apertures upon its vertical axis and in alinement with the apertures of the cross-bars, a sleeve adapted to slide within the aperture of the upper cross-bar and to engage and hold the envelop, and a bushing of refractory non-electric-conducting material fitted within the sleeve and adapted to loosely receive a carbon pencil but to be filled thereby to the substantial exclusion of the air.

3. In an electric-arc lamp adapted to employ a pair of carbon-pencil electrodes, the combination with a frame having a pair of side posts, a pair of vertically-alined apertured cross-bars connecting the side posts, carbon-carrying mechanism adapted to provide for the simultaneous mutual approach of the carbon pencils, a diaphanous arc-inclosin g envelop seated upon the lower cross-bar and having upper and lower carbon receiving apertures upon its vertical axis and in alinement with the apertures of the cross-bars, a sleeve fitting within the aperture of the upper cross-bar and capable of vertical reciprocation and normally engaging and holding the envelop, a bushing of non-e1ectric-conducting refractory material Within the sleeve, the apertures for admitting the carbon pencils to the envelop being so contracted that the circulation of air therethrough is substantially cut off by the pencils.

In testimony whereof I affiX my signature in presence of two witnesses.

JOHN A. MOSHER.

Vitnesses:

Louis K. GILLSON, RICHARD H. WYMAN. 

